MultiBuy addon doesn't work

MultiBuy addon doesn't work

The plugin does not work even on a completely clean system (the official Joomla! 3.3.6 Stable) + Joomshopping 4.8.1 with demo data.

I installed the plugin as it says in the instructions , checkboxes and general button "buy" appeared (http://joxi.ru/p27oXaaTLGpY27), but after selecting the item and pressing the button , a blank page - http://joxi.ru/MAjpxEEIdW7lme

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Aw: MultiBuy addon doesn't work

Install "MultiBuy 1.0.3"